Typewriting machine



Aug. 1 1928. 1,680,124

- J. WALDHEIM TYPEwRITIkG MACHINE FiledJune' 15, 1925 I 2 Sheets-Sheet l Affwwey/ Aug. 7, 1928. fi,80,124

J. WALDHEIM TYPEWRITING MACHINE Filed June 13, 1925 2 Sheets-Sheet 2 Patented Aug. 7, 1928.

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, JO N WALDHEIM, or ELIZABETH, anew nssienozarro nn nnnwoon ELLIOTT FISHER oo'MrAnY, or NEW YORK, N. Y., A CORPORATTON or DELAWARE.

.TYPEVTRITING MACHINE.

-App1ication filed June 12,1925. serial-Insane.

, facture than heretofore.

The outer casing or shell of the cabinet may comprise a lower bocly pa1t and a cover hinged thereto at the back, each made from a single blank of light sheet-metal. These parts may be quickly shaped, thereby providing a bottom end walls and front and back walls for the body-part-casing, and a top, end Walls and front and back walls for the cover-casing. Integral, transverselybentfiaps are provided on all end walls for fastening certain edges of the casings. Fewer assembly operations are required than usual. V a

One of the features is the provision of a lightand inex )ensive soundfdeadening1ining. The soun deadening property of the cabinet resides mainly in the light, felt lin ing attached to the inner surfaces of the metal casing, the lining having small closelyspaced pits or cavities throughout its area impinged by sound-waves.

The cabinet may have a glass-covered view-opening of the usual kind, and a slot scaled by novel thick felt lips through which may project extended carriage finger-pieces. Theseresilient lips may be used without reinforcing rubber strip, 7 I

-Other features and advantages 'will hereinafter appear.

In the accompanying drawings,

Figure 1 is an end elevation, partly in section. of an Underwood typewriting machine enclosed in a sound-deadening cabinet embodying the present invention,

V body-part.

' portion Figure 5 is a similar view, the cover being shown in partly raised position. A

Flgure 6 is a diagram on a reduced scale of a sheet-metal blank from which the easmg of the lower body p'art of the sounddeadening cabinet embodying the present invention may be .made.

Figure 7 is a 'diagran on a reduced scale a sheet-metal blank from which the easing of the cover of the sound deadening cabinet embodying the present invention may be made.

Figure 8 is a diagram on a reduced scale of another form of a sheet-metal blank from which the casing of the cover of the sounddeadeuing cabinet of the present invention may be made.

An Underwood typewriting machine 10 may be su pported on feet 11 and have a frame-extension 12 in which are arranged banks of keys A finger-piece 1 arranged for manipulating the carriage 16, may extend outside the sound-deadening cabinet of the present invention through a slot 70 at the front, sealed by yielding felt lips 66 and 67. A platen llmay be mounted in side frames 18 on the carriage 16 in the usual way.

The cabinet may have a lower body'part 20 provided with a casing or shell made from a single blank 21 of thin sheet-metal. lhe casing-blankfil may, have a bottom and plane front and back wallportions 23 and24, and partly concave end wall portions and 25" bent upwardly about fold-lines 31 and 32, "respectively. The right and left ends of the front and back walls 23 and 24 may be concave and aranged to join closely with the concave end portions of the walls 25 and 25". The front wall 2-3 may have an outwardly-extending offset to provide room for the lips 66 and 67 between the front wall and the frame-member 15 of the machine 10. This offset may be made by bending a first front walleXtension 29 outwardly and upwardly about the fold line 34, and then bending a second extension 30 vertically. Horizontal extensions 23?, 24 and 25" are provided at the left of the front and back wall-portions 23 and 24 and the end wall-porti on 25 to provide room for travelof the carriage 16 which is greater to and of thecasing 21 to the bent front and back wall-portions 23 and 24, holes 38 may be provided inthe latter positioned adjacent their-edges at suitable intervals for registering with holes 37 in flaps 37,

[integral with the concave end wall-portions 25 and 25", and which may be bent transversely thereto to engage against the inner surfaces of said front and back walls 23 and 24 of the caslng. The outer surfaces of said concave end wallportions2:3 and 25 are arranged to fit neatly flush with the concave edges of said front and back wallportions 23 and 24c. To permit the flaps 37 to be bent so that they may be riveted fiat against the inner surfaces of the front and back walls 23 and 24 ofthe casing without twisting adjacent portions of the end walls,

or otherwise marring the appearance of the finished cabinet, short slits 37* are cut in the metal of the end walls on one or both sides of each flap. The above-described coni struction provides a light, inexpensivecasing with neat, smooth edges and close joints where the end walls join the back and front Walls.

A cover 40 may be pivoted to the bodypart 20 at the back thereof by hinges 39. The outereasing or shell of the cover l0 may be made from a single blank 41 of thin sheet-metal. The casing ll may have an upwardly-inclined fiat top portion l2 provide d with a work-sheet view or inspection opening 43 of the usual kind arranged to be closed with a glass plate 62 fastened to the cover by clips 63 and screws 63. The cover-casing ll may have a rounded top portion 42 a back wall-portion 4.4-, end wallportions 45 and a low front wall-portion 46. Each of the end walls 45 may have a curved edge arranged for close engagement with the curved top-portion 42, and straight edges arranged'for fitting with the inclined top portion 42 and the front wall 46, and a, straight bottom edge. The end walls 45 may be integrally joined to the back wall l-l along the fold-lines 47, and may be fastened to the top and front wall-portions of the cover-casing ll at suitable intervals by riveting to the same transversely-bent integral flaps 4-8 wh ch have holes 48 arranged to register with holes 49 adjacent the edges of the top and'the front wallportions. The end Wall-flaps 48 may be arranged with slits 48 for being neatly riveted in the same way as described above for riveting the flaps 37. a

It can be readily seen that the above-described casing forthe sound-deadening cabinet of the present invention may be light in weight, strongly and inexpensively made,-

and form cracks in a cabinet through which sound vibrations may escape.

An interior sound-deaden1ng lining is provided for the cabinet of the present 1n-- vention which includes two different kinds of hnlng." On the bottom of'the cabinet may be cemented a smooth layer 59-of felt, as is usually employed. To the top, end walls and back and front walls, exceptas hereinafter noted, alining 60 may be attached, preferably by cementing,which may have its inner surface, which is impinged by the sound-Waves of the typewriter 10,

roughened or pitted for diffusing and re-' fracting the'impinging sound-waves. Small closely-spaced cavities or pits 61* extend partly through the lining 60. 'By' closely spacmg the pits 61, the sound waves are diffused and refracted, and thereby weakice ened, and also a very large per cent of the volume of the lining is-occupied by the pits. A preferred method in the present inventionfor making the pitted lining 60 for use in sound-deadening cabinets is tomake the lining of two felt layers, which may be cemented together. An outer layer 6O which comes next to the outer casingiof the cabinet may be a smooth layer of felt. 1 An inner layer 6O may be thicker than the outer layer 60 and have small, closely-spaced holes or perforations 61 extending entirely through it,'which'are madebefore the layers 60 and 60 are cemented "together; The holes 61 maybe made by punching a large number at one time. The manylit-tle disks cut out ofa layer of felt will-have a Sal-- vage value, since they can be used'in making other'materials, such as buildingpaper.

The net cost of the pitted, two-layer-felt, V sound-resisting lining of the present invention may thereby be smaller than t-he cost of the usual smooth felt of the same thickness. It is obvious that it will be lighter. Reduction in the weight'of the cover of a sou'nd deadening cabinet for atypewriting machine makes it easier forth'e operative 5 to swing the cover open; A pitted or roughened lining of felt has better soundretarding properties than a lining made of inseam an outer layer of felt and an inner perforated layer of metal or hard material. The portions of felt between the pits will offer more resistance to sonnd-vibrati ons than similar portions of harder material. Also, the sides of small pits and cavities in felt are rougher than the sides of small holes through a metal plate, and thereby oli er more resistance to the passing of sound-- waves in air through the small pits or holes to the bottom thereof.

To allow the extended finger-piece 1-1 to project outside the sound deadening cabinet of the present invention, the front-wall ektensi-onE-BO of the hody-part 20, and the front wall 46 of the cover & do not meet. a The slot 70 caused thereby in the cabinet is arrangedto be sealed by two thick lips 66 and 67, made of closely-woven, resilient felt held to said frontfwall-eX-tension and said front wall 46 by metal plates 68 and screws its shown in Figure 2, the'rear sides of the lips 66 and 67 will liein substantially the same vertical plane when the lips first touch each other as the cover 40 is being closed or opened. The front sides of the lips may be tapered inwardly, giving the adjoining extremities of the lips a substantially wedge-shapedcross-section. The arrangement of these wedge-shaped sections causes the lips 66 and 67 to-be bent inwardly, as shown in Figure 1, when the cover is closed. By making the felt lips 66 and 67 sufliciently thick as regards the width of the slot 70 (approximately of an inch in the usual cabinets), they may have sufficient resiliency in themselves to seal the slot 70 and close around the finger-piece 14: without requiring additional reinforcing layers of resilient material, like rubber, as would be necessary were'the lips thin. It will be noted that the lips 6 6 and 67 have extensions reaching downwardly and upwardly to the adjacent extremities of the lining 60, thereby serving to prevent any sound-waves from reaching the casing-wall portions 29, 30 and i6. 1

In Figures i and 5 are shown means of sealing with onefeltlip 167, a slot 170 in the front of a sound-deadening casing embodying certain features of the present invention. The felt lip 16T'and a resilient rubber,

reinforcing strip next to the cover 140, are

held on the cover 'by'the plate (38' and screws 69. The front wall-extension 130 of the body-part may have a level inwardlyprojeeting flange 131 arranged for engagement with the lip 167, A level straight portion 14 ofthe finger-piece 14 may be ar ranged to slide along on top of the flange 131. The lower extremity of the lip'l'G? may have a front side which is substantially vertical when the cover 140 begins to raise from the body-part 120, and its rear side may be inclined downwardly and outwardly to form a substantially wedge-shaped section with the front side. The lip 167 is bent outwardly onthe flange 131 when the cover H0 is closed, thereby sealing the slot 170, and closing around the finger-piece portion 1%, and allowing it to be freely moved sidewise.

in Figure 8 is shown a diagram of an other form of sheet-metal blank from which. the casing of the cover of the sound-deadening cabinet of the present invention may be made. It may have its various portions, namely, the end walls 52, the top and back 51 and the front wall 5% bent to shape and fastened together in a similar manner to that described above for the cover-plate blank shown in Figure 7. j Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim: a

1. The combination with a typewriting machinehaving an extended carriage lingerpiece, of a sound-deadening cabinet having an outer casing of sheet-metal and an inner felt lining with an interior, pitted surface, said casing having a lower body-part ar ranged for receiving said machine and a cover, said body-part and said-cover being hinged together at the back and arranged. with a slot between them at the front through which said linger-piece projects, and two resilient felt lips arranged for sealing said slot. i

The combination with a type'vvriting machine, of a sound-deadening cabinet having' a sound-retarding lining made of two closely held layers of felt, the outer layer being of uniform thickness with smooth sur faces, and the inner layer havingsmall, closely spaced holes or perforations through it. 7 8. An article of manufacture consisting of a lower body-part of a sound-proof c1 binet for receivinga typewriting' machine prolUU vided with a keyboard in such a manner as to expose the keyboard as a projection through an opening therein, said cabinetbody including a casing made from a sheet metal blank having a plurality of members bent to relatively form a bottom, a verticallydisposed-plane front wall having an opening for said keyboard, a pair of opposite, concave end walls diverging outwardly at the top, and outwardly extending offset walL member above said opening, also a verticallydisposed-plane rear wall having concave end portions diverging outwardly at the top, and two partly concave end walls having relatively plane portions extended vertically upward from the concave portions thereof.

4. An 'articleof manufacture consisting of an upper eover-part-of a sound-proof cabinet for a tvprwriting machine, including a casing made from a sheet-metal blank bent to relatively form an upwardly inclined top curving downwardly and terminating in a vertically-(lisposed-plane rear wall, a front 'wall p rallel therewith, and a pair of verti-V cally-disposcd-plane end walls provided with bent tongues secured to the adjacent interior walls of the cover. j

5. An article of manufacture consisting of a sound-retarding felt lining for asounddeadening cabinet for a typewriting machine, said lining having small, closely spaced, inwardly-opening pits or cavities arranged for diffusing and refracting impingpartly concave and partly vertical, the

rear element having partly-concave and partly-straight side edges arranged for form ing a vertical back wall of said casing with integral overhanging end portions, said rear element having a narrow rectangular lateral extension at its left side adjacent its outer edge, and a forwardly-positioned element having a portion of the same shape and size as said rear element disposed next to said central element, on the opposite side of said rear element, for forming a lower section of the front wall of said casing, said forwardly-disposed element having also a narrow rectangular strip joining said lower portion at its outer edge, and a second rectangular strip on the outer edge of said firstnamed strip, said first-named strip to be bent outwardly and upwardly from the lower vertical portion of said front wall, said secondnamed strip to be bent'vertically upward, saidforwardly-disposed element having a substantially rectangular hole through it, whereby the keyboard of said machine may project through said casing, said right and left hand elements having small forwardly and rearwardly projecting flaps with perforations therethrough, said perforations being disposed for registering with perforations provided in said forward and rear elements adjacent the concave edges thereof upon bending all of said elements to their final positionin said casing and upon bending said flaps to lie against the under side of the front and rear walls of said casing.

7. A sheet-metal blank for forming-the outer casing of a cover of a sound-deadening cabinet of a typewriting machine, including a rectangular central element arranged for forming a lower front wall, a partly plane and partly-curved top, and a rear wall of said covercasing, said rectangular element having a rectangulr view-openingthrough'it adjacent said front wall-portion, and wing against the partly-curved and partly-plane top of said casing when said wing-elements are'bent at right angles'to the rear wall-:

portion of said central element after the latter is bent to form said top, front wall and rear wall, said wings having smallflaps with perfo 'ations, the latter being disposed for registering with perforations in said central element adj a'cent the right and left side edges thereof upon bending said central element and said wing-elements to their final position in said cover-casing and upon bending said flaps to lie against the under side of the top andthe front wall of said cover.

8'. A sound-proof cabinet for a typewriting machine having a composite wall including an imperforate, relatively thin extended body and a perforate inner lining therefor of fibrous material so disposed as to expose the perforationsthereof to the-interior chamber of said cabinet. H

9, A soundsproo f cabinet for a typewriting machine having a composite wall iiieluding a sheet-metalouter' wall, an intermediate continuous body of fibrous material, and an inner perforate lining of fibrous material so relatively disposed as to expose the perforations thereof to the interior chamber of said cabinet and likewise expose said intermediate body thereto through said perforations. V I p 10., A. sound-proof cabinet for a typewritingniachine having a composite wall including an outer continuous and relatively smooth wall, an intermediate, continuous fibrous body secured within the same, and a perforate inner lining secured to. said intermediate body in such a manneras to expose the same through'the perforations and said perforations to the interior chamber of said cabinet. 7 5

11. In a sound-proof cabinet for a typewriting machine having-an outer enclosing wall, an inner continuous-lining of'sound absorbent, fibrous material, and means'for greatly increasing the sound-absorbing surface thereof including a second perforate lining of fibrous material cemented fto the continuous lining to form a double lining therewith in such amanner as to expose the continuous lining through the perforations and said. perforations tofthe interior chamber ofsaid-cabinet. I V

12. An article ofmanufacture consisting of a lowerbody-part of a sound-proof cabinet for receiving a'typewriting machine pro vided with a keyboard, said cabinet-body including a casing made from a sheet-metal blank having a plurality of members bent to relatively form a bottom wall, a verticallydisposed-planefront wall having an opening for said keyboard, an outwardly extending offset wall-member above said opening, in

tegral, concave end portions on the front wall, a vertically-disposed-plane back wall having corresponding integral, concave end portions, a right-hand end wall curving outwardly from the bottom upward, surmounted by a vertically d sposed portion, and a left end wall curved in opposite outward direction from the bottom upward and terminae ing in a level portion surmounted by a vertically disposed end wall-member.

13. The combination with a typewriting machine having an extended carriage-fingerpece, of a sound-deadening cabinet, said cabinet having a slot at its front through Which said finger-piece projects, and a sound-retarding seal for said slot, said seal consisting of two oppositely-disposed strips of resilient felt arranged in vertical alignment, providing one strip on each side of the slot, and an exteriorly beveled edge on each strip providing together in initial raised position a concave felt seal erteriorly and a relatively plane felt seal within the cabinet.

14. The combination with a typewriting machine having an extended carriage-fingerpiece, of a sound-deadening cabinet having a lower body-part and a cover, said cover and said body-part having a hinged connection at the back and a slot at the front through which said finger-piece projects, said slot having a sound-retarding seal cons'sting of two oppositely disposed and aligned strips of closely-Woven felt to provide one strip on each side of said slot, and an exteriorly bev' eled edge on each strip providing together upon one side a felt trough and on the other a relatively plane felt seal in initial opening and closing POSlUlOIlS, and in closed position an inwardly projecting double felt seal in such relative disposition that the beveled edges meet with the extreme portions of the bevels conformably in contact.

15. The combination with a typewriting machine having an extended carriage-fingerpiece, of a sound-deadening cabinet having a lower body-part and a cover, said cover and said body-part having a hinged connection at the back and a slot'at the front through which said finger-piece projects said slot having a sound-retarding seal including upon one edge a plane felt strip arranged in, alignment with the arc of movement of the cover having one plane side, and a beveled edge upon the other side of said strip conditioned upon closure of the cover to be turned in curved manner transversely to the normal plane of the unbeveled portion and plane sides of said felt strip.

JOHN \VALDHEIM. 

